refined topbar height difference calculation

lib/res/dimens.dart

@@ -30,9 +30,8 @@ class Dimens {
   static const double disabledOpacity = 0.38;
 
   // TopBar
-  /// Probably this is a bad practice, but with text size locked, the height is always 212
+  static const double readingContainerDoubleValueHeight = 128;
   static const double readingContainerSingleValueHeight = 76;
-  static const double readingContainerDefaultHeight = 288;
 
   // `CenteredSlider`
   static const double cameraSliderTrackHeight = grid4;

lib/screens/metering/components/camera_container/widget_container_camera.dart

@@ -4,6 +4,7 @@ import 'package:lightmeter/data/models/exposure_pair.dart';
 import 'package:lightmeter/data/models/film.dart';
 import 'package:lightmeter/features.dart';
 import 'package:lightmeter/platform_config.dart';
+import 'package:lightmeter/providers/features_provider.dart';
 import 'package:lightmeter/res/dimens.dart';
 import 'package:lightmeter/screens/metering/components/camera_container/components/camera_view/widget_camera_view.dart';
 import 'package:lightmeter/screens/metering/components/camera_container/models/camera_error_type.dart';
@@ -49,11 +50,20 @@ class CameraContainer extends StatelessWidget {
         ((MediaQuery.of(context).size.width - Dimens.grid8 - 2 * Dimens.paddingM) / 2) /
             PlatformConfig.cameraPreviewAspectRatio;
 
-    double topBarOverflow = Dimens.readingContainerDefaultHeight - cameraViewHeight;
+    double topBarOverflow = Dimens.readingContainerSingleValueHeight + // ISO & ND
+        -cameraViewHeight;
     if (FeaturesConfig.equipmentProfilesEnabled) {
       topBarOverflow += Dimens.readingContainerSingleValueHeight;
       topBarOverflow += Dimens.paddingS;
     }
+    if (MeteringScreenLayout.of(context, MeteringScreenLayoutFeature.extremeExposurePairs)) {
+      topBarOverflow += Dimens.readingContainerDoubleValueHeight;
+      topBarOverflow += Dimens.paddingS;
+    }
+    if (MeteringScreenLayout.of(context, MeteringScreenLayoutFeature.reciprocity)) {
+      topBarOverflow += Dimens.readingContainerSingleValueHeight;
+      topBarOverflow += Dimens.paddingS;
+    }
 
     return Column(
       children: [

lib/screens/metering/components/shared/readings_container/widget_container_readings.dart

@@ -4,6 +4,7 @@ import 'package:lightmeter/data/models/film.dart';
 import 'package:lightmeter/features.dart';
 import 'package:lightmeter/generated/l10n.dart';
 import 'package:lightmeter/providers/equipment_profile_provider.dart';
+import 'package:lightmeter/providers/features_provider.dart';
 import 'package:lightmeter/res/dimens.dart';
 import 'package:m3_lightmeter_resources/m3_lightmeter_resources.dart';
 
@@ -42,6 +43,7 @@ class ReadingsContainer extends StatelessWidget {
           const _EquipmentProfilePicker(),
           const _InnerPadding(),
         ],
+        if (MeteringScreenLayout.of(context, MeteringScreenLayoutFeature.extremeExposurePairs)) ...[
           ReadingValueContainer(
             values: [
               ReadingValue(
@@ -55,12 +57,15 @@ class ReadingsContainer extends StatelessWidget {
             ],
           ),
           const _InnerPadding(),
+        ],
+        if (MeteringScreenLayout.of(context, MeteringScreenLayoutFeature.reciprocity)) ...[
           _FilmPicker(
             values: Film.values,
             selectedValue: film,
             onChanged: onFilmChanged,
           ),
           const _InnerPadding(),
+        ],
         Row(
           children: [
             Expanded(